@en|Scanning of a November 15, 1930 [[Parker]] advertising for the [[Duofold]] model. Published on ''Collier's''. Retouched by the author for a better sharpness. Date on the other side of the sheet. | @en|Scanning of a November 15, 1930 [[Parker]] advertising for the [[Duofold]] model. Published on ''Collier's''. Retouched by the author for a better sharpness. Date on the other side of the sheet. |